{
  "manageEntity": {
    "action": "Save",
    "entityId": "40401280",
    "entityType": "Track",
    "nonce": "0xad148b30767cc000f1236fc747cf1ad72fad087fb672d48dfba6ee4f6bd01ef5",
    "signature": "0xb3c340a71b339e8120caa4ef35a2b4849997a2929f31c9cc7df6f4465096e5ee1e3c363fdda58ad01b639553f99805781e4be93eb726481c5f744a85284201651c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}